Well, depends on what you can get a hold of. I would recommend nice slacks (khakis/chinos) in your color of choice. Brown, grey, or navy would look nice. I have two recommendations for the top. (1) Either a purple tee with the cutie mark painted on (use fabric paint or acrylic paint mixed with fabric medium), or a ready made tee (if you can find one). (2) Or, if you're feeling particularly fancy, try a white button down shirt, navy or dark purple tie, with a purple vest. You can make a felt cutie mark and sew/pin it to the vest; if you can't find the vest, add the cutie mark to your tie. Wear appropriate shoes (loafers or dress shoes). Optional: carry around a Spike plushie. Hope this is useful!